Rob Bogus <[EMAIL PROTECTED]> wrote:
> I'm attaching a tiny program to show that isn't the case. It's for
> zeroing out large files. If you have a disk intensive application you
> might run this to zero out say 50GB or so, and compare the impact on the
> application with dd of /dev/zero using 1024k buffer size. The program
> has compiled on rh7.2 thru FC4, SuSE, ubuntu, etc, no kernel headers or
> GNU needed, you want the POSIX behaviour, or at least I do.
Your program is not POSIX as it uses O_DIRECT and posix_memalign()
(the first is no POSIX at all, the latter is optional.....).
But now I see where you like to use O_DIRECT.
If you use O_DIRECT for writing, it makes sense and in the same case
it makes sense to use directio(fd, DIRECTIO_ON); on Solaris.
Although on Solaris, it only saves System CPU time and I cannot see
an wall clock improvement.
Whether this makes sense with the _output_ file from star or mkisofs
needs to be tested.....
Jörg
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